.footer{
    position: fixed;
      bottom: 0px;
      left: 0;
      width: 100%;
      height: 72px;
      background: #fff;
      border-top: 1px solid #ccc;
      display: flex;
      justify-content: space-between;
  }
.tab{
    width: 25%;
    text-align: center;
    
}
.box{
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 15px;
  color: #666;
}
.iconfont{
  font-size: 23px;
}
.tab span{
  margin-top: 10px;
  font-size: 14px;
}